How many chess moves are made by Americans each year?
How much cat litter did Americans scoop last year?
Look for the answers online at tpt.aapt.org under “Browse,” at the very end of the current issue.
Question suggestions are always welcome!
For more Fermi questions and answers, see Guesstimation 2.0: Solving Today’s Problems on the Back of a Napkin, by Lawrence Weinstein (Princeton University Press, 2012).
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